/*
  *获取指定日期的前一天，后一天
  *date 代表指定的日期，格式：2018-09-27
  *day 传-1表始前一天，传1表始后一天
  */
 const getNextPreDate = function getNextPreDate(date) {
  
    var weekday="";
    let mydate = date;
    let myweekday = mydate.getDay();
    let mymonth = mydate.getMonth() + 1;
    let myday = mydate.getDate();
    let myyear = mydate.getYear();
    myyear = (myyear > 200) ? myyear : 1900 + myyear;
    if (myweekday == 0) {
      weekday = " 星期日";
    } else if (myweekday == 1) {
      weekday = " 星期一";
    } else if (myweekday == 2) {
      weekday = " 星期二";
    } else if (myweekday == 3) {
      weekday = " 星期三";
    } else if (myweekday == 4) {
      weekday = " 星期四";
    } else if (myweekday == 5) {
      weekday = " 星期五";
    } else if (myweekday == 6) {
      weekday = " 星期六";
    }
     return mymonth+"月"+myday+"日"+"  "+weekday
    };
  
    export default getNextPreDate
     
  